665976001 has 4 divisors (see below), whose sum is σ = 666099504. Its totient is φ = 665852500.

The previous prime is 665975963. The next prime is 665976013. The reversal of 665976001 is 100679566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665976001 - 2¹⁹ = 665451713 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665976901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53275 + ... + 64576.

It is an arithmetic number, because the mean of its divisors is an integer number (166524876).

Almost surely, 2^665976001 is an apocalyptic number.

It is an amenable number.

665976001 is a deficient number, since it is larger than the sum of its proper divisors (123503).

665976001 is a wasteful number, since it uses less digits than its factorization.

665976001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123502.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 665976001 is about 25806.5108257587. The cubic root of 665976001 is about 873.2786844806.

The spelling of 665976001 in words is "six hundred sixty-five million, nine hundred seventy-six thousand, one".